TSB 654.20 — Buick, Cadillac, Chevrolet and GMC Software update
654.20 is a software update on file with NHTSA for 10 Buick, Cadillac, Chevrolet and GMC models, 2023–2026 model years, filed and re-filed as 6 documents. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. • Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Fixes to help prevent erroneous missing key messages on driver display. • Fixes…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Worth checking your VIN against. 654.20 is filed as a software update, which unlike an ordinary bulletin can mean free or reimbursed work when a vehicle qualifies. Ask a dealer using the document ID below, and check open recalls separately at nhtsa.gov/recalls.
Vehicles and model years 654.20 names
Every document filed under 654.20
Manufacturers re-issue a bulletin as the repair changes, and file separate copies for technicians and for owners. All of them carry the same number.
| Document ID | Filed | Type |
|---|---|---|
| 654.20 | February 27, 2026 | Software update |
| 654.20 | February 26, 2026 | Software update |
| 654.20 | February 17, 2026 | Software update |
| 654.20 | January 30, 2026 | Software update |
| 654.20 | January 30, 2026 | Software update |
| 654.20 | December 10, 2025 | Software update |
Questions buyers ask
What is TSB 654.20?
654.20 is a software update filed with NHTSA by Buick, Cadillac, Chevrolet and GMC, covering 10 Buick, Cadillac, Chevrolet and GMC models across the 2023–2026 model years. NHTSA's summary reads: • Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Fixes to help prevent erroneous missing key messages on driver display. • Fixes…
Which vehicles does 654.20 cover?
NHTSA's file names Buick Enclave (2025–2026); Cadillac Escalade (2023–2024); Chevrolet Silverado 1500 (2024, 2026); Chevrolet Silverado 2500 (2024, 2026); Chevrolet Suburban (2023–2024); Chevrolet Tahoe (2023–2024); Chevrolet Traverse (2024–2026); GMC Acadia (2024–2026); GMC Sierra 1500 (2024, 2026); GMC Yukon (2023–2024). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB 654.20 a recall, and is the repair free?
654.20 is filed as a software update, not a recall — but this is the kind of communication that can mean free or reimbursed work if your VIN qualifies. Take the number to a dealer and ask. Recalls are separate and always free; check yours by VIN at nhtsa.gov/recalls.
How do I get the full text of 654.20?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under 654.20, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under 654.20. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.